ISO 20206:2015

INTERNATIONAL ISO
STANDARD 20206
First edition
2015-08-15
Space data and information transfer
systems — IP over CCSDS space links
Systèmes de transfert des informations et données spatiales —
Protocole Internet utilisant les liaisons spatiales CCSDS
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 20206 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as
CCSDS 702.1-B-1, September 2012) and was adopted (without modifications except those stated in clause 2
of this International Standard) by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 13, Space data and information transfer systems.

Recommendation for Space Data System Standards
IP OVER CCSDS
SPACE LINKS
RECOMMENDED STANDARD
Note:
This current
issue includes
all updates through
CCSDS 702.1-B-1
Technical Corrigendum 1,
dated April 2014
BLUE BOOK
September 2012
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
AUTHORITY
Issue: Recommended Standard, Issue 1
Date: September 2012
Location: Washington, DC, USA
This document has been approved for publication by the Management Council of the
Consultative Committee for Space Data Systems (CCSDS) and represents the consensus
technical agreement of the participating CCSDS Member Agencies. The procedure for
review and authorization of CCSDS documents is detailed in Organization and Processes for
the Consultative Committee for Space Data Systems, and the record of Agency participation
in the authorization of this document can be obtained from the CCSDS Secretariat at the
address below.
This document is published and maintained by:

CCSDS Secretariat
Space Communications and Navigation Office, 7L70
Space Operations Mission Directorate
NASA Headquarters
Washington, DC 20546-0001, USA
CCSDS 702.1-B-1 Page i September 2012
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
STATEMENT OF INTENT
The Consultative Committee for Space Data Systems (CCSDS) is an organization officially
established by the management of its members. The Committee meets periodically to address
data systems problems that are common to all participants, and to formulate sound technical
solutions to these problems. Inasmuch as participation in the CCSDS is completely
voluntary, the results of Committee actions are termed Recommended Standards and are
not considered binding on any Agency.
This Recommended Standard is issued by, and represents the consensus of, the CCSDS
members. Endorsement of this Recommendation is entirely voluntary. Endorsement,
however, indicates the following understandings:
o Whenever a member establishes a CCSDS-related standard, this standard will be in
accord with the relevant Recommended Standard. Establishing such a standard
does not preclude other provisions which a member may develop.
o Whenever a member establishes a CCSDS-related standard, that member will
provide other CCSDS members with the following information:
-- The standard itself.
-- The anticipated date of initial operational capability.
-- The anticipated duration of operational service.
o Specific service arrangements shall be made via memoranda of agreement. Neither
this Recommended Standard nor any ensuing standard is a substitute for a
memorandum of agreement.
No later than three years from its date of issuance, this Recommended Standard will be
reviewed by the CCSDS to determine whether it should: (1) remain in effect without change;
(2) be changed to reflect the impact of new technologies, new requirements, or new
directions; or (3) be retired or canceled.
In those instances when a new version of a Recommended Standard is issued, existing
CCSDS-related member standards and implementations are not negated or deemed to be
non-CCSDS compatible. It is the responsibility of each member to determine when such
standards or implementations are to be modified. Each member is, however, strongly
encouraged to direct planning for its new standards and implementations towards the later
version of the Recommended Standard.
CCSDS 702.1-B-1 Page ii September 2012
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
FOREWORD
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights. CCSDS shall not be held responsible for identifying any or all such
patent rights.
Through the process of normal evolution, it is expected that expansion, deletion, or
modification of this document may occur. This Recommended Standard is therefore subject
to CCSDS document management and change control procedures, which are defined in
Organization and Processes for the Consultative Committee for Space Data Systems
(CCSDS A02.1-Y-3). Current versions of CCSDS documents are maintained at the CCSDS
Web site:
http://www.ccsds.org/
Questions relating to the contents or status of this document should be addressed to the
CCSDS Secretariat at the address indicated on page i.
CCSDS 702.1-B-1 Page iii September 2012
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
At time of publication, the active Member and Observer Agencies of the CCSDS were:
Member Agencies
– Agenzia Spaziale Italiana (ASI)/Italy.
– Canadian Space Agency (CSA)/Canada.
– Centre National d’Etudes Spatiales (CNES)/France.
– China National Space Administration (CNSA)/People’s Republic of China.
– Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)/Germany.
– European Space Agency (ESA)/Europe.
– Federal Space Agency (FSA)/Russian Federation.
– Instituto Nacional de Pesquisas Espaciais (INPE)/Brazil.
– Japan Aerospace Exploration Agency (JAXA)/Japan.
– National Aeronautics and Space Administration (NASA)/USA.
– UK Space Agency/United Kingdom.
Observer Agencies
– Austrian Space Agency (ASA)/Austria.
– Belgian Federal Science Policy Office (BFSPO)/Belgium.
– Central Research Institute of Machine Building (TsNIIMash)/Russian Federation.
– China Satellite Launch and Tracking Control General, Beijing Institute of Tracking
and Telecommunications Technology (CLTC/BITTT)/China.
– Chinese Academy of Sciences (CAS)/China.
– Chinese Academy of Space Technology (CAST)/China.
– Commonwealth Scientific and Industrial Research Organization (CSIRO)/Australia.
– CSIR Satellite Applications Centre (CSIR)/Republic of South Africa.
– Danish National Space Center (DNSC)/Denmark.
– Departamento de Ciência e Tecnologia Aeroespacial (DCTA)/Brazil.
– European Organization for the Exploitation of Meteorological Satellites
(EUMETSAT)/Europe.
– European Telecommunications Satellite Organization (EUTELSAT)/Europe.
– Geo-Informatics and Space Technology Development Agency (GISTDA)/Thailand.
– Hellenic National Space Committee (HNSC)/Greece.
– Indian Space Research Organization (ISRO)/India.
– Institute of Space Research (IKI)/Russian Federation.
– KFKI Research Institute for Particle & Nuclear Physics (KFKI)/Hungary.
– Korea Aerospace Research Institute (KARI)/Korea.
– Ministry of Communications (MOC)/Israel.
– National Institute of Information and Communications Technology (NICT)/Japan.
– National Oceanic and Atmospheric Administration (NOAA)/USA.
– National Space Agency of the Republic of Kazakhstan (NSARK)/Kazakhstan.
– National Space Organization (NSPO)/Chinese Taipei.
– Naval Center for Space Technology (NCST)/USA.
– Scientific and Technological Research Council of Turkey (TUBITAK)/Turkey.
– Space and Upper Atmosphere Research Commission (SUPARCO)/Pakistan.
– Swedish Space Corporation (SSC)/Sweden.
– United States Geological Survey (USGS)/USA.
CCSDS 702.1-B-1 Page iv September 2012
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
DOCUMENT CONTROL
Document Title Date Status
CCSDS IP over CCSDS Space Links, September Original issue
702.1-B-1 Recommended Standard, Issue 1 2012
CCSDS Technical Corrigendum 1 April 2014 Cor.1:
702.1-B-1 Editorial change 1 – clarifies distinction
Cor.1 between Protocol ID
EC 1 space for the
Encapsulation Service
and IPE Header
Protocol ID space.
EC 1:
– updates superseded
references with
current issues;
– updates obsolescent
style elements.
CCSDS 702.1-B-1 CCSDS 702.1-B-1 Cor. 1 Page v SeptemAber 2012 pril 2014
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
CONTENTS
Section Page
1 INTRODUCTION . 1-1

1.1 PURPOSE . 1-1
1.2 SCOPE . 1-1
1.3 DEFINITIONS . 1-1
1.4 CONVENTIONS . 1-2
1.5 REFERENCE DOCUMENTS . 1-3

2 OVERVIEW . 2-1

2.1 GENERAL . 2-1
2.2 SERVICE OVERVIEW . 2-2
2.3 FUNCTIONS OVERVIEW . 2-2

3 SERVICE DEFINITION . 3-1

3.1 OVERVIEW . 3-1
3.2 SUMMARY OF PRIMITIVES . 3-1
3.3 SUMMARY OF PARAMETERS . 3-1
3.4 SERVICE ASSUMED FROM THE UNDERLYING SUBNETWORK . 3-2
3.5 IPOC SERVICE PRIMITIVES . 3-3

4 PROTOCOL DEFINITION . 4-1

4.1 PROTOCOL DATA UNIT . 4-1
4.2 PROTOCOL PROCEDURES AT THE SENDING END . 4-2
4.3 PROTOCOL PROCEDURES AT THE RECEIVING END . 4-2

ANNEX A SECURITY, SANA, AND PATENT CONSIDERATIONS
(INFORMATIVE) . A-1
ANNEX B NETWORK VIEWS (INFORMATIVE) .B-1
ANNEX C END-TO-END UPLINK/DOWNLINK FUNCTIONAL CONTEXT
DIAGRAMS (INFORMATIVE) . C-1
ANNEX D INFORMATIVE REFERENCES (INFORMATIVE) . D-1
ANNEX E ACRONYM LIST (INFORMATIVE) .E-1
Figure
1-1 Bit Numbering Convention . 1-3
2-1 Scope of IP over CCSDS Data Links . 2-1
CCSDS 702.1-B-1 Page vi September 2012
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
CONTENTS (continued)
Figure Page
2-2 CCSDS IP Transfer Services Context Diagram . 2-2
2-3 Relationship of IPE to the Encapsulation Service . 2-3
4-1 IPE Header Format and Placement . 4-1
B-1 IP over AOS VCP Service Using CCSDS IPE plus Encapsulation Service .B-1
C-1 Conceptual End-to-End Uplink CCSDS Functional Flow
for Transferring IP PDUs .C-1
C-2 Conceptual End-to-End Downlink CCSDS Functional Flow
for Transferring IP PDUs .C-2

Table
3-1 Recommended CCSDS Transfer Services for Transferring IP PDUs . 3-2

CCSDS 702.1-B-1 Page vii September 2012
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
1 INTRODUCTION
1.1 PURPOSE
The purpose of this document is to establish a CCSDS Recommended Standard specification
for the implementation of Internet Protocol (IP) over CCSDS (IPoC) Space Data Link
Protocols (SDLPs) in both spacecraft and ground systems by the Agencies participating in
the CCSDS. In essence, this book constitutes a prescriptive profile on the one method
recommended by CCSDS as the best practice for implementing IPoC.
1.2 SCOPE
This document addresses the recommended method for transferring IP Protocol Data Units
(PDUs) over CCSDS space links.
1.3 DEFINITIONS
1.3.1.1 Definitions from the Open Systems Interconnection (OSI) Basic Reference
Model
This document makes use of a number of terms defined in reference [1]. These terms are to
be understood in a generic sense, i.e., in the sense that the terms are generally applicable to
any of a variety of technologies that provide for the exchange of information between real
systems. The terms are:
a) Data Link Layer;
b) protocol data unit;
c) real system;
d) service;
e) Service Access Point (SAP);
f) SAP address;
g) Service Data Unit (SDU).
1.3.1.2 Definitions from OSI Service Definition Conventions
This document makes use of a number of terms defined in reference [2]. These terms are to
be understood in a generic sense, i.e., in the sense that the terms are generally applicable to
any of a variety of technologies that provide for the exchange of information between real
systems. The terms are:
a) indication;
CCSDS 702.1-B-1 Page 1-1 September 2012
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
b) primitive;
c) request;
d) service provider;
e) service user.
1.3.1.3 Terms Defined in This Recommended Standard
For the purposes of this document, the following definitions also apply. Many other terms
that pertain to specific items are defined in the appropriate sections.
delimited: having a known (and finite) length; applies to data in the context of data
handling.
IP PDU: Internet Protocol Protocol Data Unit; includes all IP data types e.g., IPV4, IPV6,
compressed header IP PDUs.
Physical Channel: a stream of bits transferred over a space link in a single direction.
space link: a communications link between a spacecraft and its associated ground system or
between two spacecraft. A space link consists of one or more Physical Channels in one or
both directions.
1.4 CONVENTIONS
1.4.1 NOMENCLATURE
The following conventions apply for the normative specifications in this Recommended
Standard:
a) the words ‘shall’ and ‘must’ imply a binding and verifiable specification;
b) the word ‘should’ implies an optional, but desirable, specification;
c) the word ‘may’ implies an optional specification;
d) the words ‘is’, ‘are’, and ‘will’ imply statements of fact.
NOTE – These conventions do not imply constraints on diction in text that is clearly
informative in nature.
1.4.2 INFORMATIVE TEXT
In the normative sections of this document (sections 3 and 4), informative text is set off from
the normative specifications either in notes or under one of the following subsection headings:
CCSDS 702.1-B-1 Page 1-2 September 2012
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
– Overview;
– Background;
– Rationale;
– Discussion.
1.4.3 BIT NUMBERING
In this document, the following convention is used to identify each bit in an N-bit field. The
first bit in the field to be transmitted (i.e., the most left justified when drawing a figure) is
defined to be ‘Bit 0’; the following bit is defined to be ‘Bit 1’ and so on up to ‘Bit N–1’.
When the field is used to express a binary value (such as a counter), the Most Significant Bit
(MSB) shall be the first transmitted bit of the field, i.e., ‘Bit 0’ (see figure 1-1).
BIT 0 BITN–1
N-BIT DATA FIELD
FIRST BIT TRANSFERRED = MSB
Figure 1-1: Bit Numbering Convention
In accordance with standard data-communications practice, data fields are often grouped into
eight-bit ‘words’ that conform to the above convention. Throughout this Recommended
Standard, such an eight-bit word is called an ‘octet’.
The numbering for octets within a data structure starts with zero. By CCSDS convention, all
‘spare’ bits shall be permanently set to ‘0’.
1.5 REFERENCE DOCUMENTS
The following publications contain provisions which, through reference in this text,
constitute provisions of this document. At the time of publication, the editions indicated
were valid. All publications are subject to revision, and users of this document are
encouraged to investigate the possibility of applying the most recent editions of the
publications indicated below. The CCSDS Secretariat maintains a register of currently valid
CCSDS publications.
[1] Information Technology—Open Systems Interconnection—Basic Reference Model: The
Basic Model. 2nd ed. International Standard, ISO/IEC 7498-1:1994. Geneva: ISO,
1994.
CCSDS 702.1-B-1 Page 1-3 September 2012
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
[2] Information Technology—Open Systems Interconnection—Basic Reference Model—
Conventions for the Definition of OSI Services. International Standard, ISO/IEC
10731:1994. Geneva: ISO, 1994.
[3] Encapsulation Service. Issue 2. Recommendation for Space Data System Standards
(Blue Book), CCSDS 133.1-B-2. Washington, D.C.: CCSDS, October 2009.
[4] AOS Space Data Link Protocol. Issue 2. Recommendation for Space Data System
Standards (Blue Book), CCSDS 732.0-B-2. Washington, D.C.: CCSDS, July 2006.
[5] TM Space Data Link Protocol. Issue 1. Recommendation for Space Data System
Standards (Blue Book), CCSDS 132.0-B-1. Washington, D.C.: CCSDS, September 2003.
[6] TC Space Data Link Protocol. Recommendation for Space Data System Standards,
CCSDS 232.0-B-2. Blue Book. Issue 2. Washington, D.C.: CCSDS, September 2010.
[7] Proximity-1 Space Link Protocol—Data Link Layer. Issue 5. Recommendation for
Space Data System Standards (Blue Book), CCSDS 211.0-B-5. Washington, D.C.:
CCSDS, December 2013.
[8] “Space Assigned Number Authority (SANA) Registry: Internet Protocol Extension
Header.” Space Assigned Numbers Authority. Consultative Committee for Space Data
Systems. http://sanaregistry.org/r/ipe_header/.
NOTE – Informative references are provided in annex D.

CCSDS 702.1-B-1 Page 1-4 September 2012
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
2 OVERVIEW
2.1 GENERAL
This document describes the recommended method for transferring IP PDUs over CCSDS
SDLPs: Telecommand (TC), Telemetry (TM), Advanced Orbiting Systems (AOS), and
Proximity-1 (Prox-1). IP PDUs are transferred by encapsulating them, one-for-one, within
CCSDS Encapsulation Packets. The Encapsulation Packets are transferred directly within
one or more CCSDS SDLP Transfer Frames. This method uses the CCSDS Internet Protocol
Extension (IPE) convention in conjunction with the CCSDS Encapsulation Service over
CCSDS AOS, TM, or TC Virtual Channel Packet (VCP) Service, TC Multiplexer Access
Point Packet (MAPP) Service, or Prox-1.
The CCSDS IPE convention is to prepend the CCSDS IPE octet(s) to each IP PDU,
encapsulate the result in a CCSDS Encapsulation Packet (see reference [3]), and transport the
Encapsulation Packet within one or more CCSDS SDLP frames (see references [4]-[7] and
figure 2-1). This method is recommended for all IP PDUs identified in reference [8].
IP Protocol Data Units
CCSDS
IPE
CCSDS
Encapsulation
Packet
CCSDS Space Link
AOS TM TC Prox-1
Figure 2-1: Scope of IP over CCSDS Data Links
CCSDS 702.1-B-1 Page 2-1 September 2012
CCSDS RECOMMENDED STANDARD FOR IP OVER CCSDS SPACE LINKS
2.2 SERVICE OVERVIEW
Sending end of link Receiving end of link
IPoC IPoC
Service User Service User
SDU
...